Parts required for a
Saab 9-3X
Differential/Gear Oil Replacement

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If possible I would give Josh an even higher rating than a 10. He was very thorough, professional and easy to work with.
Josh found two significant defects with my car that my regular mechanic either willfully disregarded or was too inexperienced to see and I don't believe it was the former. I look forward to seeing Josh next week to make the repairs!
Thank You Your Mechanic!
Joe

Tien was on time, the only reason I gave 3 stars is because of my unique problem. It was hard to diagnose verbally and I won't know it the work done will fix the problem because of the nature of the problem. In time I will know.
Tien did the job well based on the info provided.

All about Differential/Gear Oil Replacement

Differential oil is a type of oil. Cars have a gearbox connecting the two axles. This gearbox is responsible for the conversion of engine power and its transmission to the wheels, allowing them to turn at varying speeds. This part of the car is called the differential, and lubrication is needed for it to function properly. Differential fluid, also called differential oil, provides the lubrication and cooling of the car’s differential. The fluid is there to protect the gears’ metal surfaces from friction, and to prevent overheating and burning.

The differential is responsible for transferring the power from the engine to the transmission and the wheels, and for controlling how much power goes to each wheel. Like many aspects of your vehicle, the differential requires oil to act as lubrication. Differential oil allows the differential to move smoothly and consistently, which allows the vehicle to continue sending power to the wheels. If the differential oil is old, it may be contaminated with debris and metal shavings. This contamination will come into constant contact with the differential, which can cause severe long term damage to the differential.